不同沉淀剂加入方式对复混肥中氧化钾含量测定的影响

Effect of Different Adding Methods of Precipitants on Content Determination of Potassium Oxide in Compound Fertilizer

为考察四苯硼酸钾重量法中不同沉淀剂加入方式对复混肥中氧化钾含量测定结果的影响,对方式A(不断用玻璃棒搅拌的同时,在试样溶液中逐滴加入四苯硼酸钠溶液)和方式B(在磁力搅拌器工作的状态下,使用分液漏斗逐滴加入四苯硼酸钠溶液)开展了实验室试验研究。试验结果表明:2种沉淀剂加入方式均能够满足测定要求;方式B测定时间相对较短,有助于降低测定成本和工作强度,且精密度和回收率更为稳定。

In order to investigate the influence of different adding methods of precipitants in potassium tetraphenylborate gravimetric method on the content determination results of potassium oxide in compound fertilizer, laboratory experiments were carried out on mode A (the sodium tetraphenylborate solution was added to the sample solution drop by drop while the glass rod was continuously stirred) and mode B (the sodium tetraphenylborate solution is added by using a separating funnel drop by drop while the magnetic agitator was working).The results showed that the two adding ways of precipitants could meet the requirements of determination. The determination time of method B is relatively short, which can help to reduce the determination cost and working strength, and the precision and recovery rate are more stable.